South Capitol Street Corridor, Frederick Douglass Memorial Bridge
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SOUTH CAPITOL STREET CORRIDOR, (ICE) FREDERICK DOUGLASS MEMORIAL BRIDGE ENGINEER CHECKING CHECKING WASHINGTON, DC INDEPENDENT INDEPENDENT DDOT - District Department of Transportation Department - District DDOT Rendering/Photo credit: Rendering/Photo credit: SYSTRA IBT’s role was that of Independent Checking Engineer or ICE. In that role, SYSTRA IBT performed a completely independent analysis of the arch bridge structure based on the design plans and reports provided by the designers. This included independent modeling of the structure, structural verification of all elements from the foundations to the South Capitol Street Corridor Segment 1 main structure arches, and compliance reviews to ensure that the elements is the Frederick Douglass Memorial Bridge, a three-span arch conformed with contractual requirements. bridge over the Anacostia River. The total length is 1445’ Structural checks were performed on a pass/fail basis in (440.6m), with a main span of 540’ (164.6m) and side spans of order to maintain complete independence from the designer’s 452’-6” (138m). The deck carries eight lanes (three lanes with calculations and assumptions. Specialized analyses included one future additional lane in each direction) with a footpath on deep foundations, arch instabilities (both global and local), each side of the deck. The typical deck width is 122’-6” (37.3m) and construction sequencing and stability for both the arch and reached 166’ (50.6m) at pier location where there is a ribs and the composite deck. In the role of ICE, SYSTRA IBT was pedestrian overlook. The arches are longitudinally stiffened also involved in reviewing structurally significant changes or steel box shapes and are laterally unsupported (no transverse defects that arose during construction. bracing between arches). The steel arches are supported on post-tensioned concrete substructures and steel pipe pile ESSENTIALS: foundations. Interior piers have a V-shape. The composite deck comprises precast panels on built-up I-shaped edge girders Client/Owner: DDOT - District Prime Engineer: AECOM Department of Transportation and floor beams. The deck is suspended from the steel arches SYSTRA IBT’s Role: Contractor: South Capitol Independent Checking with vertical hangers. Bridgebuilders, a joint venture Engineer of the arch bridge between Archer Western structure. Construction LLC (Walsh Group) WWW.SYSTRAIBT.COM and Granite Construction Co..